Everything is perfect.... Except

[XCalvin]

i finally installed snow leopard on my amd system except my graphics is not working cant find any driver and stuck with 1024x768 what i need is 1600x900 can i make this work.
i had found this post on the internet:
do NOT install any nvidia drivers!!!! Instead use intel gma x3100 or 3100. Or use ati radion drivers for models that ar similar in specs(eg. 256mb) Also Install switchresx so you control resolution. NOTE: only install 1 driver GOOD LUCK
and it still doesnt work